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From: Qian Cai <>
Cc:,,, Qian Cai <>
Subject: [PATCH] usercopy: no check page span for stack objects
Date: Sun, 30 Dec 2018 22:02:54 -0500
Message-ID: <> (raw)

It is easy to trigger this with CONFIG_HARDENED_USERCOPY_PAGESPAN=y,

usercopy: Kernel memory overwrite attempt detected to spans multiple
pages (offset 0, size 23)!
kernel BUG at mm/usercopy.c:102!

For example,

char name[WQ_NAME_LEN] = { };
char desc[WORKER_DESC_LEN] = { };
  probe_kernel_read(name, wq->name, sizeof(name) - 1);
  probe_kernel_read(desc, worker->desc, sizeof(desc) - 1);

This is because on-stack variables could cross PAGE_SIZE boundary, and
failed this check,

if (likely(((unsigned long)ptr & (unsigned long)PAGE_MASK) ==
	   ((unsigned long)end & (unsigned long)PAGE_MASK)))

ptr = FFFF889007D7EFF8
end = FFFF889007D7F00E

Hence, fix it by checking if it is a stack object first.

Signed-off-by: Qian Cai <>
 mm/usercopy.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/usercopy.c b/mm/usercopy.c
index 852eb4e53f06..a1f58beaa246 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -262,9 +262,6 @@ void __check_object_size(const void *ptr, unsigned long n, bool to_user)
 	/* Check for invalid addresses. */
 	check_bogus_address((const unsigned long)ptr, n, to_user);
-	/* Check for bad heap object. */
-	check_heap_object(ptr, n, to_user);
 	/* Check for bad stack object. */
 	switch (check_stack_object(ptr, n)) {
 	case NOT_STACK:
@@ -282,6 +279,9 @@ void __check_object_size(const void *ptr, unsigned long n, bool to_user)
 		usercopy_abort("process stack", NULL, to_user, 0, n);
+	/* Check for bad heap object. */
+	check_heap_object(ptr, n, to_user);
 	/* Check for object in kernel to avoid text exposure. */
 	check_kernel_text_object((const unsigned long)ptr, n, to_user);
2.17.2 (Apple Git-113)

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